End stop for separable fasteners and method of forming the same



July 5, W49. L. H. MORIN 2,474,908

END STOP FOR SEPARABLE FASTENERS AND METHOD OF FORMING THE SAME Filed July 30, 1943 IN VE'N TOR Patented July 5, 1949 END STOP FOR SEPARABLE FASTENERS AND METHOD OF FORMING THE SAME Louis H. Morin, Bronx, N. Y., assignor of one-half to Davis Marinsky, Bronx, N. Y. 1

Application July 30, 1943, Serial No. 496,704

4 Claims.

This invention relates to separable fasteners in which a slider moves along the stringers to couple and uncouple the links of the stringers. More particularly, the invention relates to end stops pre-formed with tape engaging flanges or jaws which are normally widely spaced to facilitate free mounting on the stringer tapes and moved into firm engagement with the tapes upon compression of the end stop body or blank. Still further, the invention comprises the formation of stops of the kind described from die cast members or blanks. and in forming key means on the compressed members to engage the beadededges of the stringer tapes.

The novel features of the invention will be best understood from the following description when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed, and in which the separate parts are designated by suitable reference characters in each of the views, and in which:

Fig. 1 is a diagrammatic view of one end portion of a pair of stringer tapes, showing an end stop thereon with a slider checked on the stringers by said stop.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is a perspective view of a die cast stop member prepared for free attachment to stringer tapes.

Fig. 4 is a sectional view of the stop indicating the normal size of the stop blank in dotted lines, and the finished attached stop in full lines, omitting the stringer tapes for sake of clarity.

Fig. 5 is an end view of a stop in the unattached position or blank form, and showing a slight modification.

Fig. 6 is a view similar to Fig, 5, showing the device in the form assumed after attachment to stringer tapes.

Fig. '7 is a plan view partly in section of a bridge stop, showing a modified contour which adapts the stop to checking, the wide or diverging end of the slider; and

Figs. 8 and 9 are views similar to Figs. 5 and 6, showing another modification.

In the construction of stop devices for checking the movement of a slider at the ends of separable fastener stringers, it has been common to employ sheet metal stampings pronged, flanged or otherwise formed to engage the tape edges. These type of devices have been objectionable from the standpoint of weakening the tapes in attachment of the stops. In other instances, cast bodies have been formed with open channels to receive the beaded edges of the stringers, and the 2 walls of the channels have been reformed or bent inwardly in securely attaching the stops to the stringer tapes. This other method has also been objectionable from a standpoint of weakening a wide spacing between the flange ends, facilitating free passage of the beaded edges of the stringers into the channels of the end stop body.

After attachment and proper location upon the stringer tapes, the body is placed under compression so as to move the opposed walls of the body toward each other, and correspondingly move the inturned flanges into firm engagement with the tape edges. The stop compression of the body is taken up through the web structureioining .the side walls, which web structure is bulged or enlarged within the channels or otherwise re-shaped in the movement of opposed walls ofthe body toward each other. This method of forming end. stops eliminates destruction of the end stop body, and further provides a definite control of gripping pressure upon the beaded edge portions of the tape, thus minimizing the weakening of the stringer tapes, where said stops are attached.

For purposes of illustrating one use of the invention, I have diagrammatically represented-in Fig. l of the drawing small portions of one end of two stringer tapes l0 and ii, to the beaded edges I2 of which are attached, at spaced intervals, coupling links or scoops i3 for coupling the stringer together. These links or scoops are coupled and uncoupled by a slider l4 movable along the stringers and the slider is shown in Fig. 1 with its contracted end l5 arranged upon an end stop iii. In other words, the end stop, or at least part thereof is adapted to enter the contracted channel end of the slider 14 in checking the opening movement of the slider. The stop I6 is shown in detail in Figs. 3 and 4, and in attached cross sectional form in Fig. 2.

In Fig. 3 of the drawing is shown a perspective view of what may be termed an end stop blank which represents a die castbody having similar side walls I! spaced by a central connectapart a sufllcient distance to provide free placement of the stop body upon the beaded edges of the stringer tapes, and in like manner, the op-v posed surfaces 22 of the walls l1 spaced.

are also widely In attaching the stop IE to the stringer tapes.

the blank is placed under compression in a suitable machine or by suitable tools, so as to move.

the walls i'I toward each other. The result of this operation is diagrammatically illustrated in Fig. 4, in which figure the normal position and spacing of the walls I! is indicated in dotted lines. After compression is indicated in full lines, which is a position similar to the stop as shown in section in Fig. 2 of the drawing.

In this -compression operation the normal straight side walls of the web 18 are bulged outwardly, as seen at 23, into the channels 20. This operation will also aid in engaging the beaded edges H of the stringer tapes, as will be apparent. This bulging produces a key like structure on the end stop, sufllciently indenting the head of the tapes to aid in retaining the stop against sliding movement longitudinally of the tapes. In other words, it might be said that the bulges 23 apply edgewise pressure upon the beads l2, while the walls I! apply surface pressure to these beads from opposite sides of the tapes and the flanges is have a pressure engagement with the surfaces of the tapes adjacent the beads.

In Figs. 5 and 6 is shown a stop blank 24 having a connecting web 25. The web has side surfaces 26 which after compression of the blank forms bulged or protruding members 26' on the web 25,as is illustrated in Fig. 6.

In Figs. 5 and 6, the stop is further modified in employing wider webs 25. For example, in producing what is commonly referred to as bridge stops, similar to the stop 21. shown in Fig. 7 of the drawing, this type of stop compensates for the normal spacing of the stringers at what is commonly referred to as the top end. In other words, when the wide or diverging end '28 of the slider it reaches the other end of the stringers, as shown in Fig. 1, stops such as 2'! are preferably fashioned to provide concaved surfaces 28 at one end thereof to receive the end 28 of the slider. The opposed end of the stop is correspondingly convexed, as seen at 30. The web 2i will be similar to the web of the stops 24, illustrated in section in Figs. 5 and 6.

In Figs. 8 and 9 is shown another modification where the stop body 32 has a web portion 22. which is recessed centrally, as seen at II, throughout the full length of the web, to divide the web into two side wall portions 35. With this construction, and after compression of the stop 32. the walls 35, bulge outwardly to form the protruding keying members 36 for engagement with the beaded edge of the stringer tapes.

While this structure is particularly applicable to the bridge type of end stop, as disclosed in Figs. 5, 6 and 7, it is also applicable to the stops of the type and kind shown in Figs. 1 to 4. Any sub-division of the web centrally and longitudi nally will form the dual wall portions, such as the walls 35, and these walls will assist the combeaded edges of stringer tapes.

aid in forming the protruding key members for engaging the beaded edges of the tape.

It will also be apparent that the contour of the apertures or recesses, such as 34 may be shaped in any desired manner.

It will be apparent that the end stop members orblanks may be formed of any die cast or molded 'material, and whenthese materials are thermoplastic, they will be heated sufficiently to soften the material prior to the compression operation.

One-of thedistinctive advantages in a preformed blank or end stop member resides in the fact that the opposed wall structure of the resulting end stop can definitely be controlled as to size and contour. This is particularly desirable within stops of the type and kind shown in Figs. 1 to 4 inclusive where the end stop enters the slider. or in other words, the slider rides ver the end stop.

From a structural standpoint the end stop comprises. a blank body having Dre-formed inturned flanges at side edges thereof which are normally widely spaced to facilitate free attachment to the These flanged edges may be said to be the gripping jaws of the end stop. In other words, jaws which are normally opened and closed upon the tape in applying pressure to the side walls of the end stop, as heretofore set forth.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. As an article of manufacture, an end stop blank for use in forming stops limiting movement of a slider. along the stringers of separable fasteners, said blank comprising a body having parallel walls joined and Spaced by a web extending the full length of said walls centrally thereof, side edges of said spaced walls having inturned flanges forming in conjunction with the web longitudinal channels between said walls at opposite sides thereof. opposed surfaces of the inturned walls at each side of said body being spaced apart to form passages opening into said channels, and said web having a passage extending longitudinally thereof.

2. As an article of manufacture, an end stop for use in limiting movement of a slider along the stringers of separable fasteners, said stop comprising a body having walls joined and spaced by a web extending the full length of said walls centrally thereof, side edges of said spaced walls having inturned flanges forming in conjunction with the web longitudinal channels between said walls at opposite sides thereof, opposed surfaces of the inturned walls at each side of said body being spaced apart to form passages opening into said channels, said web having a passage extending longitudinally thereof, opposed walls of said passage. being concave in cross section, and outer surfaces of the web being convexed in cross section.. 1

3. The method of forming stops at the ends of stringers of separable fasteners to check movement of the sliders on the stringers, which com-' prises pre-forming a body comprising walls joined and spaced by a central longitudinal web and with inturned flanges at side edges of said walls, spacing the walls and opposed surfaces of said inturned flanges sufliciently to provide free mounting of the body upon adjacent edges of two stringer'tapes, mounting the body on said stringer tapes. then compressing said body to move'the preaion operation upon the stop body. and also wells and flanges toward each other to firmly grip 5 the edges of said tapeswhile maintaining said walls .in the same angularrelation to each other and during said compression step distorting said web on opposite sides thereof to form bulging portions which engage and indent said tape edges. 5

throughout the length of the web and laterally into each channel, said protruding portions serving to engage the beaded edges of the tape to key the stop member against movement longitudinally of the tapes.

LOUIS H. MORIN.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,609,080 Freysinger June 12, 1928 1,673,322 Freysinger June 12, 1928 1,873,872 Carr Aug. 23, 1932 2,115,369 Marinsky Apr; 26, 1938 2,174,160 Marinsky et a1. Sept. 26, 1939 2,192,013 Marinsky Feb. 2'7, 1940 2,231,645 Ulrich Feb. 11, 1941 2,312,045 Morin Feb. 23, 1943 

